Fix crash when running the quick drive test

.bin/Scripts/functions/hw_diags.py

@@ -341,6 +341,7 @@ def menu_diags(*args):
             action_entries = actions,
             spacer = '──────────────────────────')
         if selection.isnumeric():
+            ticket_number = None
             if diag_modes[int(selection)-1]['Name'] != 'Quick drive test':
                 clear_screen()
                 print_standard(' ')